Waterproof Plunger Switch – J4 Series

A Plunger Switch Built to Last – J4 Series

Waterproof Plunger Switches for heavy duty applicationsOur high-performance plunger switches use the same patented “double seal” ball carrier design as the J4 ball switch. CPI offers tremendous flexibility in mounting and details of actuator parameters.

These ultra-rugged plunger switches can be configured for the most demanding applications with a wide variety of contact options. Both custom and off the shelf, versions are available.


  • Stainless steel construction
  • Completely submersible (meets IP68)
  • Plunger seals, wiper seals and hardenend actuator configurations
  • Ultra high-temperature capability
  • Normally open and normally closed versions available

Plunger Switch with mounted heatsink for high temp app.

Variable parameters

  • plunger length
  • actuator shape/size
  • mounting thread
  • terminations
  • actuation force
  • travel parameters
  • sealed or vented extension
  • seal configuration
  • normally open and normally closed versions available


  • Hatch / door interlock switch (amphibious military vehicles)
  • valve position sensing (diesel turbochargers, coking ovens)
  • cab down position sensing
  • service door interlock (safety shut-down)
  • hydraulic valve handle position sensing

J4 plunger data sheet thumbJ4 Plunger Data Sheet